AZEK Building Products’ parent company, Scranton, Pa.-based CPG International, Monday announced plans to acquire TimberTech, the Wilmington, Ohio, manufacturer of composite decking, railing, and accessory products.

The move unites two of the biggest manufacturers of composite and PVC decking and sets up a battle with Trex for dominant market share in pro yards. CPG expects to finalize the acquisition by the end of September. Neither company responded to calls for comment.

"Our goal is for our AZEK business and TimberTech to join forces,” Eric K. Jungbluth, CEO of CPG, said in a statement. “We believe this powerful combination will not only create the largest manufacturer in the trim, decking and railing market, but will also create a premier company in the industry as both entities manufacture highly engineered, outdoor living solution products that offer exceptional aesthetics, performance and longevity.”